Exercise Machine Phase Detection for Adaptive Resistance Control
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Solution Overview
Problem
Existing exercise monitoring systems struggle to accurately detect repetitions and phases of movements due to variations in user movement, making it difficult to monitor and control exercise machines effectively.
Innovation Solution
The system employs a digital strength trainer with sensors and a motor controller to detect the first repetition and phases of a repetition by analyzing a stream of measurements, applying time constraints, and controlling resistance based on detected phases, using technologies such as three-phase brushless DC motors and encoders to provide precise tension control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional exercise monitoring systems are used, then the system is simple to operate, but the measurement precision of repetitions and phases is poor due to user movement variations
Solution Approach 1:
The exercise movement is divided into distinct phases (concentric, eccentric, isometric) with specific detection criteria for each phase. The system segments the continuous movement stream into discrete measurable events, allowing precise detection of repetition boundaries and phase transitions despite user movement variations.
Solution Approach 2:
The system dynamically adjusts detection parameters and resistance levels based on real-time phase detection. The motor controller continuously monitors movement characteristics and modifies resistance in response to detected phases, enabling accurate repetition counting while adapting to individual user movement patterns.
2Productivity
If real-time phase detection and control is implemented, then the productivity of exercise monitoring is improved, but the device complexity increases due to multiple sensors and control mechanisms
Solution Approach 1:
The motor controller serves multiple functions: it provides resistance control, detects movement phases, counts repetitions, and adjusts tension levels. This multi-functionality consolidates what could be separate complex subsystems into a single integrated control unit, improving productivity while managing device complexity.
Solution Approach 2:
The system implements continuous feedback loops where sensor data from movement detection is immediately processed to adjust resistance and provide real-time monitoring. This feedback mechanism enables efficient real-time phase detection and control, allowing the system to respond dynamically to user exercise patterns.
3Adaptability or versatility
If resistance control is adjusted based on detected phases, then the adaptability of the exercise machine is improved, but the manufacturing precision requirements increase for the motor controller and sensors
Solution Approach 1:
The system changes resistance parameters dynamically based on detected exercise phases. By adjusting tension, speed, and force parameters in response to phase detection, the system achieves high adaptability for different exercise types and intensity levels while using standard manufacturing tolerances through software-based control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate real-time detection and control of exercise repetitions and phases, allowing for personalized and effective resistance adjustment, adaptable to various types of exercise machines, including cable resistance systems.
Implementation Method 1
The motor is a three-phase brushless DC motor
Implementation Method 2
using technologies such as three-phase brushless DC motors and encoders to provide precise tension control
Data Source
AI summary
Controlling an exercise machine includes receiving a stream of measurements of extension of a component of an exercise machine. It further includes detecting a first phase of a repeated motion. It further includes detecting a transition to a second phase of the repeated motion. A time constraint is applied to the detection of the transition to the second phase of the repeated motion. It further includes controlling a resistance associated with the second phase of the repeated motion.